Circuit closer for burglar alarms



. Nov. 18,' 1924. 1,516,216 l L. S. STANKIEWICZ V CRCUIT cLosR FOR BURGLAR ALARMS Filed Das.l z2. 1919 Patented Nov. 18, 1924.

PATENT OFFICE.

LUDWIK S. STANKIE'WICZ, OF CHICAGO, ILLINOIS.

CIRCUIT CLOSER FOR BURGLAB, ALARME.

Application tiled December 22, 1919.

To all 'whom if may concern:

Be it known that I, LUDWIK S. STANKIE- wrcz, a citizen oit the United States, residing at Chicago, in the county of Cook and State ot Illinois, have invented a certain new and useful Improvement in Circuit Closers for Burglar Alarms, ol which the following is a full, clear, concise, and exact description,

reference being had to the accompanying drawings forming a part of this specifica tion.

My invention relates to circuit closer tor burglar alarms.

Cnc of the objects of the invention is to provide a novel and advantageous circuit closer for burglar alarms.

Another object of the invention is to make the system inexpensive in construction, and accurate and reliable in operation.

In the accompanying drawings 1 is a front elevation of a door provided witl burglar alarm arrangement embodying my invention;

Fig. 2 is a sectional view oit a portion ot the door and part oit the burglar alarm arrangement; and

Fig. 3 is a. sectional view showing detail of construction.

In the drawings I show a door 1 mounted on hinges 2 and 3, which are secured to a wall l. The door is provided with a plate 5 having a handle 6. A knob 'l is provided which has a spindle Y passing through the plate The knob operates in connection with a lock 8 which is mounted in the door as best shown in Fig. 2.

By turning knob 7, a pivoted member which is mounted on spindle 7n is rotate., thereby actuating a bell crank 10 pivoted at 11. The Ibell crank 1() operates the bolt 12 which is arranged to slide back and :torth to latch the door and is provided at its outer end with the usual inclined end ber 13. The inner end of the bolt 12 is provided with a washer 111 and this is ranged to act simultaneously upon coiled spring members 15, which latter aro secured. to the wall or frame ot the lock, but insulated therefrom by means of insulated strips 16-16 on opposite sides of said wall or frame member, and also by tubular insulat- Serial No. 346,655.

ing pieces 17-17 surrounding the bolts 18 by which said springs 15 are secured in position. Coiled spring 15a encircles and yieldingly holds the bolt in its outer position.

Electrical conductors 19 and 20 are connected to the bolts or screws 18 and are extended from the same to a suitable burglar alarm.

In the arrangement shown these conductors 19 and 20 extend along the door. either inside or outside ot the same to an alarm such as an electric bell or buzzer. A battery 23 is shown connected in the circuit, as is also an opening and closing switch 2&1.

When the bolt 12 is moved in to unlatch the door, the washer 14- will strike against the springs 15 and thereby close the circuit through the conductors 19 and 20, and this will cause the operation ot the alarm 22` Obviously the bolt 12 must be operated in order to open the door, so that even though the burglar succeeds in picking the lock and entering the house, nevertheless the alarm will be given simply by throwing the ordi nary bolt by operating the knob 7. To make the alarm or system inoperative, as for evn ample, during the day with the family in the house, the switch 24 may be opened.

Cbviously the arrangement may be applied to various terms or types of locks, and to various parts or movable members thereof, and various other changes and modifica tions may be made without departing from,

the spirit ot the invention.

What I claim is:

A lock operated circuit closer comprising a pair ot contact members, a longitudinally movable bolt, a washer mounted on the bolt so as to bridge the contact members when the bolt is moved inwardly, a knob, a pivoted member, a bell crank abutting the washer, said bell crank and pivoted member operatively connecting the knob with the bolt, and a spring yieldingly holding the washer away from the contact members.

In witness whereof, I hereunto subscribe my name this 19th day of December, A. D.

LUDWIK S. STANKIEWICZ. 

